Vulcanizer



Dec. 2, 1924. 1,517,517

\ E. w. MELVIN VULCANIZER Filed Aug. 19, 1922 ERNEKST M MELVIN INVENTOR Patented Dec. 2, 1924.

UNITED STATES PATENT OFFICE.

' ERNEST W. MELVIN, OF MILWAUKEE, WISGONSIN, ASSIGNOR TO THE FISK RUBBER COMPANY, OF CHICOPEE FALLS, MASSACHUSETTS, A CORPORATION OF MASSA,

CHUSETTS.

'V'ULGANIZER.

Application filed August 19, 1922. Serial No. 582,890.

To all whom it wmy cmwem:

Be it known that I, Ennns'r W. Mnnvm, a citizen of the United States, and a resident of Milwaukee, in the county of Milwaukee and State of Wisconsin, have invented certain new and useful Improve ments in Vulcanizers, of which the following is a specification.

Upon inspecting inner tubes after they have been cured some are found to have slight defects such as small pin holes. It is customary to repair these defects and sell the tubes as seconds. Heretofore these defects have been repaired by clamping the tube between two flat members one of which is heated to vulcanizing temperature. This produces a discoloration of the tube over the entire area of the members and also shows the impression of the members andv In the drawings I have shown a base ll screw-threaded at-12 to receive the corre spondingly scrcu threaded ring 13 adapted to engage a ring 14 which in turn overlies the flange 15 of a flexible ball-shaped member 16 which may be made of rubberor rubberized fabric. When.the ring 13 is retated it rides on the ring 14 to securely fasten the spherical member 16,without distorting it, to the base 11 to form an air chamber 17. The base 11 is also provided with an aperture 18 and a valve 19 to admit air into the chamber 17 In using this device the ball-shaped mem-' ber 16 is inflated to form a suitably rigid secondary member for the repair vulcanizer and the tube placed with the defective porone form tion directly above the ball-sha ed member and the clamps (not shown) tig tened until the ball is depressed to contact'over the defective area. It is obvious that in this way any discoloration or impression is confined to the defective area and usually will be almost imperceptible.

I have disclosed a specific embodiment of my invention but this disclosure is illustrative only and my invention is not limited thereto.

I claim:

1. A secondary member for an inner tube repair vulcanizer comprising a resilient 7 spherical member adapted. to contact only the defective area of-the tube.

2. A. secondary member for an inner tube.

repair vulcanizer comprising a resilient spherical member adapted to be depressed to contact over a greater area of the tube.

3. A secondary member for an inner tuberepair vulcanizer comprising an inflatable resilient convex member adapted for variable contact with the' surface of the tube so as-to contact only with the defective area thereof.

4. A secondary member for an inner tube repair vulcanizer comprising a'base, an inflatable resilient convex member adapted 1, to selectively engage only the defective area means adapted to engage of the tube, an said inflatable member to fasten it to said base to form an air chamber.

spherical member-adapted to .be depressed to contact over a greater area of the tube, means adapted .to engage said spherical member to fasten it Zto a. base to form an air chamber, and aba'se provided.with an aperture which is in communication with an air valve andssaid air chamber.

6.'A secondary member for a repair vulcanizer comprising a resilient convex member adapted to be variably distorted to contact over a correspondingly varying area.

In testimony whereof have signed my name to the abovespecification.

ERNEST w. MELVIN.

5. A secondary member. for an inner tube repalr vulcanizer comprlsmg an inflatable 

